ACTIVITY,PTOLEMAIC MODEL,COPERNICAN MODEL,BRAHE,KEPLER,GALILEO,NEWTON UNIT,CLAUDIUS PTOLEMY,LIVED,ROME,MODEL,THE SOLAR SYSTEM,HEAVENLY SPHERE,REFINEMENT,PREVIOUS,DEVELOPED,GREEK,ASTRONOMERS,PTOLEMY,MAJOR,CONTRIBUTION,EXPLAIN,HEAVENLY BODIES,THE MODEL,UNDERSTANDING,THE STRUCTURE,BEYOND,THE SCOPE,COURSE,DISCUSS,THE COMPLEX,SOCIAL,HISTORICAL,IMPLICATIONS OF,EARTH CENTERED,VERSUS,NEARLY,THE EARLY,VERSION,THE EARTH,THE CENTER,ENTIRE,UNIVERSE,THE PLANETS,DIRECT,PLANET,SPHERE,CIRCLE,EPICYCLE,DEFERENT,THE STARS,CELESTIAL SPHERE,THE OUTSIDE,PLANETARY SPHERES,FAME,COMES,FIGURED,INFLUENCE,SUMMARY,EVERYTHING,ASTRONOMY,THE JOB,THE ASTRONOMER,WAS TO,THE WANDERERS,UNIFORM CIRCULAR MOTION,KIND,MOTION,GEARS,WHEELS,SHOW,APPEAR,SPEED UP,SLOW DOWN,TRICKS,EPICYCLES,WEVE,TRICK,MOVE,THE OBSERVER,THE CIRCLE,PUTTING,ECCENTRIC,POSITION,THE THIRD,EQUANT,ILLUSTRATED,HERE,INDICATION,GOOD,MODERN,MOTORS,REPRODUCE,APPEARANCE,THE SKY,VIEWED,EARTH,PLANETARIUM PROJECTOR,UNIFORM,MOTOR,MOVES,THE PLANET,PROJECTOR,BIG CIRCLE,CASE,GEAR,TAKES,THE PLACE,TRADITIONAL,FACT,PLANETARIUM,PROJECTORS,THE UNIVERSE,ALMOST,YEARS AGO,SEEM,IMPRESSIVE,HOW LONG,ACCEPTED,SOCIETY,FINALLY,THE NEXT,SUBUNIT,